Method of and apparatus for drying coated paper.



C F. PEASE.

METHOD OF AND APPARATUS FOR DRYING COATED PAPER.

APPLICATION FILED MAR. 6.19)?- l,%60,570. Patented Mar. 26, 1918.

6 SHEETS-SHEET l- C. F. PEASE.

METHOD OF AND APPARATUS FOR DRYING COATED PAPER.

APPLICATION FILED MAR. s. 19H.

1,260,57U. Patented Mar. 26,1918.

6 SHEETSSHEET 2.

C. F. PEASE.

METHOD OF AND APPARATUS FOR DRYING COATED PAPER.

APPLICATION FILED MAR. 6. Hill.

Patented Mar. 26, 1918.

6 SHEETS-SHEET 3.

C. F. PEASE.

METHOD OF AND APPARATUS FOR DRYING COATED PAPER.

APPLICATION FILED MAR. 6.191].

Patented Mar. 26

SHEEI 4.

5 SHEETS- I l|1|| I I---1 ||1|l1- C. F. PEASE.

METHOD OF'AND APPARATUS FOR DRYING COATED PAPER.

APPLlCATlON FILED MAR. 6. 1911.

LZGQWU. Patented Mar. 26, 1918.

6 SHEETSSHEET 5.

o o o C. F. PEASE.

METHOD OF AND APPARATUS FOR DRYING COATED PAPER.

APPLICATION FILED MAR. s. 1911.

1,260,570 Patented Mar. 26, 1918.

-6 SHEETS-SHEET 6.

Chicago, in the county of Cook and CHARLES H. PEASE, OF CHICAGO,ILLINOIS, ASSIGNOR TO THE CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

METHOD OF, AND APPARATUS FOR DRYING COATED PAPER.

To all whom it may concern:

-Be it known that I, CHARLES F. PEAsE, a citizen of the United States,residin at tate of Illinois, have invented a certain new and usefulImprovement in-Methods of and Apparatusfor Drying Coated Paper, of whichthe following is a full, clear, concise, and

' exact description.

This invention relates to a method of and apparatus *for drying paperand particularly blue print paper after the same has.

' I been coated with a suitable sensitizing compound.

Heretofore, paper of this kind, after it has been coated with the usualsensitizing solution, has been dried in a medium containingaconsiderable amount of moisture,

which hasinjurlous effects upon the quality of the paperand alsomaterially shortens the period within which it can be commer ciallyused; In other words, the finished paper as produced by the methods nowin common use, deteriorates rapidly, due to the ineffective dryingthereof.

It i an important-object of the present invention therefore, to providean improved method of treating the paper after the same has been coatedwhereby substantiall all moisture is effectively removed there rom,thereby greatly increasing the life and quality of the paper.

Another object of the resides in the provision o ratus for carrying intoeffect the above method and wherein said paper is passed through aplurality of chambers to thorou hly dry the same.

ther object and advantages will be apparent from the followingdescription, taken in connection with the accompanying drawings, whereintwo embodiments of the inventionzare shown. It will be readilyunderstood however, thatthe drawings are for purposes of illustrationonly, and not as defining the limits of the invention.

Figure 1 is a diagrammatic view of the invention.

Fig. 2 is a longitudinal sectional view of a drying cabinet constructedin accordance .with the resent invention.

- Fig. 3 15 5 transverse section-taken on the liire 33 of Fig. 2. I

Fig. 4. is a transverse setion'taken on the resent invention a sultableappaas line H of Fig.2

Specification of Letters Patent.

Application filed llfliarch 6, 1917. Serial N 0. 152,519.

Patented Mai. as, rare.

Fig. 5 is a sectional view taken on the line 55 of Fig. 2.

Fig. 6 is a detail view.

Fig. 7 is a diagrammatic view of a modified form of the invention; and

C. F. PEASE COMPANY, OF

Fig. 8 is a sectional view taken on the line 88 of Fig. 7

The drying cabinet is shown in the drawings at 10, and is supported on,-suitable uprights 11, mounted on the standards 12. The drying cabinet ispreferabl provided with a plurality of drylng cham ers 13, 14, throu hthe former of which is circulated through the latter of which iscirculated hot air. The term combustion heat is herein used todesignateatmospheric 'air which has been heated by direct contact withthe combustion gases of an open flame.

a The drying cabinet 10 is shown provide with a suitable baflie plate 15positioned within the chamber 13, said bafile plate be ing adapted toprevent the combustion heat which is circulated through said chamberfrom passing into the chamber 14. This baffle plate 15 also serves toguide the combustion heat after it has been passed through the chamber13, out through the outlet 16. Mounted within the entrance chamber 17 ofthe drying cabinet 10 is shown a bank of suitable heating tubes 18, atthe lower end of which is provided an open flame heater 19. Theseheating tubes 18 are what 1s herein termed combustion heat, and

shown open at both ends to permit of the pasage of air over the flame 19and upward through said tubes and into the combustion heat chamber 13.Within the base of the drying cabinet 10, there is another set of openflame heaters 20, the flames from which are adapted to contact with theheatin chamber 21, through which air is circulated by means 'of asuitable circulating fan 22 adapted to be driven by a motor 23 or anyother suitable means. The base plate 24 of the heating chamber 21 ispreferably corrugated to permit of its expansion and contraction, due tothe changes in temperature toawhich it is subjected. Suitable openings25-are provided in the plate positioned beneath the heaters 20'to permitof. the passa e of atmospheric air ov'e'rsaid heaters. ThlS air, afterit has been passed over the heaters, is conducted through a suitableconduit 26, which is shown surrounding the heating chamber 21, passesthrough suitable ports 27 stantially over the entire width of the dry--ing 36 is shown provided in the return pipeand out through the outlet 28intothe entrance chamber 17, where it is conducted into the combustionheat chamber 13 and through the outlet 16. Leading from the fan 22 is asuitable conduit 29, through which air is fed to the heating chamber 21.

' This air, after it has been thus heated, passes into the transversechamber 31, from whence it is forced into the hot air chamber 14 throughsuitable elongated slotted openings 32. Positioned within the hot airchamber 14 is shown a return header 33 provided with an elongated slot34 which extends subing cabinet 10. This return header is connected by asuitable return pipe 35 with the fan 22, the operation of said fan 22acting to producea suction within the return pipe and header. It willthus be seen that the air within the chamber 14 after the same has beencompletely circulated therethrough,

is drawn into. the header 33 and throughthe return (pipe 35 to the fan22, said fan causing sai air to again circulate through the variousconduits to the hot air chamber as just described. A suitable intakeopen- 35 at the point adjacent the fan housing 37. Through this opening,fresh air is drawn into the circulatmg system and mixed with the heatedair, as it is forced therethrougli.

- It will be noted from the construction just described, that the hotair which is used in connection with the present method is kept incontinuous circulation. The combustion heat chamber 13 and the hot airchamber 14 are separated by a suitable corrugated plate 38. J

The transverse chamber 31 is shown provided with a suitable outletnozzle 39 'exfro tending into the entrance chamber 17 directly above thecombustion heat outlet 28.

The air forced through this n0zzle'39. pro-- duces a suction efi'ect onthe combustion heat within the outlet 28, tending to draw the sameupward and into the entrance chamber 17. This construction produces amore elfecti've circulation of the combustion heat through the'conduit26 and eliminates g a definite amount of the air in the chamber- 14,which'isreplaced by fresh air thereby preventing the circulating. air ombecomingmoist.

The uncoated paper is mountedat 40 and is own passing over suitablerollers, 41

whi v act-taooat paper with the usual income sensitizing solution, saidsolution being conmounted in the bracket 43, said bracket beingvertically adjustable along the rod 44. Also mounted in this bracket 43is shown a scraping'element 45 which is adapted to bear against thepaper as it is passed over said rollers to remove therefrom any sur pluscoating; After the paper has thus been scraped, it is passed throughatmospheric air under ordinary conditions, and then through the entrancechamber 17 of the drying cabinet 10, the combined combustion heat andthe hot air from the outlets 28 and 39 being forced into contact withthe uncoated side of the said paper, as the same is thus being passedthrough said entrance chamber 17. The paper is then passed over theroller 46 and through the chamber 13, where it is subjected to thecombustion heat supplied to said chamber bythe bank of.

heaters 18. After passingthrough the combustion heat chamber 13,the'paper is passed in a zig-zag path over rollers 47, through the hotair chamber 14, where substantially all of the moisture in said paper iseffectively removed. After the paper has thus been treated, it is passedout through the outlet 48 and rolled about a suitable roller 49.

It will be noted from Fig. 3 of the drawings, that the roller-s47, whichare mounted adjacent to the transverse chamber 31, are positionedbetween the elongated slotted openings 32. Thus the hot air emitted fromsaid elongated slotted openings 32-contacts with the coated surface ofthe paper as th same is fed toward the chamber 17, and also as it isfed'away from said chamber 17. The rollers 47 are shown mounted insuitable brackets .50 secured to'the uprights 11. Adjustable buldgerrods '51 are shown mounted in suitable brackets. 52 also supported onthe uprights 11, said buldger rods being adapted to bear against thesurface of the paper as shown, to hold the same" taut, as itis passedover the various rollers.

and to prevent any creasing of the paper. The drying cabinet 10 ispreferably provided with a plurality of openings 53 shown provided withdoors 54 through which access may be had to t the interior of saidcabinet for the purpose of repairing any of the parts or for adjustingthe buldger.

rods.

.InFigs. 7 and 8 is illustrated a slightly modified form of theinvention, wherein-the bank of heating tubes 18 is dispensed with, thecombustion heat from the heaters 20 being conducted through the conduit55,

which is substantially similar to the corresponding conduit 26 shown inthe preferred em d men f. the in ent n, tothe con duits 59 shownconnecting with said conduit 55 at each side of the forward end thereof.

These conduits 56 pass around the transrear of said transverse chamber31, but sutficiently spaced therefrom to provide an entrance chamber 58similar to the one shown and described in connection with the pre-'ferred embodiment. From this chamber 57 the combustion heat is conductedupwardly into the chamber 13 through a suitable outlet nozzle 59. Thesuction efiect in this construction is produced by the formation of asub-chamber 60 within the chamber 57, said sub-chamber 60 being suppliedwith hot air from the heating chamber 21 by means of suitable bypasses61 positioned on either side of the transverse chamber 31 and connectingsaidchamber with said sub-chamher. The sub-chamber 60 is shown providedwith a suitable outlet nozzle 62 through which the air thus bypassed isforced, and by means of which the desired suction efi'ect upon thecombustion heat within the chamber 57 is effected. In other respects,this embodiment of the invention is substantially similar to thepreferred construction as illustrated in the other figures of thedrawmgs.

Although blue print paper has been referred to for convenience, theinvention is applicable also to the dryin of white print paper ,or otherpaper or fabric. The utilization of combustion heat insures efliclencyof operation where open flame heaters are qemployed, as in theconstruction illustrated hereln. It will be understood, however, thatheat from any source may be used. It' 1s further apparent that variousother changes 1 and modification may be made in the construction hereinillustrated, without departing from the spirit of the invention asexpressedin the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. The improved method of drying coated paper which consists in firstpassing sald paper through a chamber contamlng combustion gases and thenpassing the same through a chamber containing circulating hot air.

2. The improved method of drying coated paper which consists in firstpassing said paper through a chamber containing combustion gases and hotair and then passing the same through a chamber containing circulatinghot air.

3. The improved method of drying sensitized paper which consists infirstsubjecting the uncoated surface of said paper to a current ofcombustion gases and hot air, then subjecting the coated surface of Saidpaper to acurrent of combustion gases and later passing said paperthrough a chambe containing circulating hot air.

4:. The improved method of drying blue print paper which consists infirst passing the same through atmospheric air at ordinary temperature,then subjecting the uncoated surface of said paper to a, current ofcombustion gases and hot air, then subjecting the coated surface of saidpaper to a current of combustion gases and later passng said paperthrough a chamber containng hot air.

5. A drier'of the type described, comprising a plurality of dryingchambers,

means for supplying one of said chambers with combustion gases and meansfor supplying the other of said chambers with hot air.

6. A drier of the type described comprising a plurality of' dryingchambers, means for supplying one of said chambers with combustiongases, means for supplying the other of said chambers with hot a1r. and

means for continuously circulating said hot a1r.

7. A drier of the type. described, comprising an entrance chamber, acombustion gases chamber, and .a hot air chamber, a bank of heatingtubes positioned within said entrance chamber and communicating withsaid combustion gases chamber, an air'heating chamber, a plurality ofheaters therefor, a combustion gases conduit surround-v ing said hot a1rheatmg chamber, said con:

duit communicating with said entrance chamber, a transverse chambercommunicat- 'ingwith said hot air chamber and with said hot air heatingchamber, said trans- -verse chamber being provided with means adapted toincrease the How of combustion gasesthrough said conduit. 8. A drier ofthe type described, comprising an entrance chamber, a combustion gaseschamber, and ahot air chamber, a bank of heating tubes positioned withinsaid entrance chamber and communicating with said combustion gaseschamber, an air heating chamber, a plurality of heaters therefor,

and means for conducting a strip of paper in a zig-zag path throughcertain of sai chambers to thereby dry thesame. w 9. In a drier of theclass described, an

entrance chamber, a combustion gases cham her, and a hot air chamber, abank of heating tubes positioned in said entrance chamher at one sidethereof, a plurality of 'outi lets o the other side thereof, one of saidoutlets being so positioned with relation to the other that the emissionof gases therefrom produces a suction efiect on the gases emitted fromthe other.

10. In a drier of the type described,--an entrance chamber, a combustiongases conduit mounted in the base of said er and plurality of rollersmounted on said uprights and adjacent said transverse chamber.

12. A device ofthe type described, comprising a plurality of uprights, adrying cabinet mounted thereon, a hot air chamber within said cabinet, atransverse chamber positioned at one end of said dryair chamher andbetween two of said uprights, said transverse chamberbeing provided witha plurality of elongated slotted ,openings adapted to emit a dryingmedium into said hot air chamber, and a plurality of rollers mounted onsaid uprights, adjacent said transverse chamber and between certain ofsaid elongated openings.

13. A drier of the type described, com

prising an entrance for the paper to be dried, a combustion gasesconduit, a hot air conduit, each of said conduits having an outlet intosaid entrance and means whereby the gases emitted from one of saidoutlets tends to increase the discharge of gases from the other of saidoutlets.

1.4. drier of the type described, comprising a plurality of outlets, andmeans whereby the gases emitted from one of said outlets tends .toincrease the discharge of gases fromthe other of said outlets, saidgases acting as a drying medium for the material. being fed through saiddrier. v 15. In a device of the type described, a drier, means forintroducing a strip of paper into (said drier and means for dlrecting acurrent of combustion gases' and hot air against said strip of paper asthe same enters said drier. v

16. In a drier of the type described, means ma am for directing acurrent .of combustion gases and dry air against a strip of paper as thesame enters said drier, and means whereby the discharge of one of saidgases into con-' tact with said paper acts to increase the discharge ofthe other of said gases into contact therewith. h

17. A drier of the type described,com prising-a plurality of dryingchambers, an air heating chamber communicating with one of said dryingchambers, and a combustion gases conduit communicating with the other ofsaid chambers, said air heating chamber being positioned within saidcombustion gases conduit.

18. Apparatus for drying sensitized paper,

comprising a plurality of drying chambers,

means for supplying heat to one of said chambers to efiect an initialdrying of said paper, means for supplying a heated atmos phere toanother of said chambers and causing it to move toward the upper partthere 0nd chamber arranged at opposite ends thereof, whereby said papermay travel back and forth over said rollers from the top to the bottomof said chamber in a plurality of' substantially horizontal spans, saidsec- 0nd chamber having an inlet at one end. thereof and having anoutlet at the other end near the top, and-means for causing a heatedatmosphere to pass through said chamber from said inlet to said outletwhereby the moisture from said paper is carried upwardly as said paperdescends.

In witness whereof, I hereunto subscribe.

my name this 7th day of February A; D. 1917.

. CHARLES r. rnasn.

